// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2018 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

// +build gogit

package git

import (
	"strings"

	"github.com/go-git/go-git/v5/plumbing"
)

// IsBranchExist returns true if given branch exists in current repository.
func (repo *Repository) IsBranchExist(name string) bool {
	if name == "" {
		return false
	}
	reference, err := repo.gogitRepo.Reference(plumbing.ReferenceName(BranchPrefix+name), true)
	if err != nil {
		return false
	}
	return reference.Type() != plumbing.InvalidReference
}

// GetBranches returns branches from the repository, skipping skip initial branches and
// returning at most limit branches, or all branches if limit is 0.
func (repo *Repository) GetBranches(skip, limit int) ([]string, int, error) {
	var branchNames []string

	branches, err := repo.gogitRepo.Branches()
	if err != nil {
		return nil, 0, err
	}

	i := 0
	count := 0
	_ = branches.ForEach(func(branch *plumbing.Reference) error {
		count++
		if i < skip {
			i++
			return nil
		} else if limit != 0 && count > skip+limit {
			return nil
		}

		branchNames = append(branchNames, strings.TrimPrefix(branch.Name().String(), BranchPrefix))
		return nil
	})

	// TODO: Sort?

	return branchNames, count, nil
}
